package Class;

public class ClassTest {
    public static void test(String s,StringBuffer sb){
        s += "123";
        sb.append("123");
    }


    public static void main(String[] args) {
        String s = "abcd";
        StringBuffer sb = new StringBuffer("abcd");
        test(s,sb);

        System.out.println(s+"   "+sb);
    }
}
